Digital circuit for providing a binary signal on the occurrence

Details Digital circuit for providing a binary signal on the occurrence Digital circuit for providing a binary signal on the occurrence

1982-02-22

1984-06-12

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

307527, H04N 944

Patent

active

044545312

ABSTRACT:
The invention provides a digital circuit for generating a binary signal output when a predetermined frequency ratio, v=f1/f2, of two signals F1 and F2 occurs during a selected measuring period. The circuit is particularly adapted for use in a color television receiver to determine the ratio between the chrominance-subcarrier frequency and the horizontal frequency, which ratio is fixed at the transmitting end, both in the PAL system and the NTSC system.

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